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Igem Microbiology Intro

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Igem Microbiology Intro iGEM Microbiology Intro Prof. Sebasan Maerkl Index • Prokaryoc Structure and Funcon – Cell components – Chemotaxis and flagellar – Living magnets • Nutrion and Growth – Growth requirements – Plang techniques – Growth curve – Chemostats / turbidostats • Microbial Genecs – Recombinaon – Transposons – Plasmids – Conjugaon – Transformaon – Transducon Prokaryoc Cell Structure • Plasma Membrane • Gas vacuole: buoyancy • Ribosomes: protein synthesis • Inclusion Bodies: storage of C, P, etc • Nucleoid: chromosomal DNA • Periplasmic space: hydrolyc and binding proteins • Cell Wall: mechanical rigidity • Capsules: resistance to phagocytosis; adhesion • Fimbriae and pili: aachments and mang • Flagella: movement • Endospore: survival mechanism 10.1016/j.cell.2008.11.016 Morphology and Classificaon Gram-Positive Gram-Negative Flagella and Chemotaxis • Tumble: – CheA autophosphorylates if MCP is not bound – CheA then phosphorylates CheY, which causes a tumble (CheYp is rapidly degraded to CheY by CheZ • Run: – Aractant binds to MCP causing a stearic shi, liming autophosphorylaon of CheA – CheYp levels drop, causing CCW rotaon • Reseng: – CheR methylates MCPs causing increased CheA autophosphorylaon – This causes increases in CheYp and CheBp, which lead to CW rotaon and de‐methylaon of MCPs Living Magnets (Magnetotacc Bacteria) • Magnetosomes consist of magnec iron mineral crystals made from: Fe3O4, greigite, or Fe3S4 • Magnetosomes align the bacteria in the geomagnec field, allowing for directed taxis Microbial Metabolism • Prototrophs: can thrive on minimal medium • Auxotrophs: lack the ability to synthesize a parcular organic compound (commonly used in yeast for selecon) Carbon Sources – Autotrophs: CO2 principal carbon source – Heterotrophs: reduced, preformed organic molecules Energy Sources – Phototrophs: light – Chemotrophs: oxidaon of organic or inorganic compounds Hydrogen or Electron Sources – Lithotrophs: reduced inorganic molecules – Organotrophs: organic molecules Algea: photolithotrophic autotrophs E.coli: chemoorganotrophic heterotroph Media • Synthec or Defined Media: all components are known. Chemoorganotrophic heterotrophs can be grown on media containing glucose, ammonium salts and other salts. • Complex Media: contain undefined components such as peptones (protein hydrolysates), meat extract or yeast extract • Selecve Media: favor parcular microorganisms • Differenal Media: permit the idenficaon of bacteria based on biological characteriscs MacConkey agar is both selective and differential: it selects for gram- negative bacteria and stains for lactose fermentation Culturing • Generaon of Pure Cultures is extremely important in general microbiology, but also in cloning! • Two approaches: streak plang and spread plang • Spread plang is also used to obtain growth curves by counng colony forming units (CFUs) • Each colony is clonal ! They arise from a single bacterium and thus are genotypically the same. OK BAD Spread Plang • Spread plang is also used to obtain growth curves by counng colony forming units (CFUs). • The most accurate count of live cells. Of course dead or dormant cells are not counted, as they do not form a colony. • Faster: opcal turbidity measurements • Bacterial lawns are generated by spread plang. • Transformed bacteria are generally spread plated. Batch Growth Nt = populaon at me t N0 = inial populaon n = number of generaons in me t n Nt = N0 x 2 Solve for n: n=logNt‐logN0/log2 Mean growth rate constant (k): k=n/t Some generation times: • E.coli: 21 minutes Mean generaon me (g): • B.subtilis: 26 minutes g=1/k • S.cerevisiae: 120 minutes • M.tuberculosis: 720 minutes (12 hours) Chemostats / Turbidostats • Chemostat: – Constant diluon rate – D=flow rate/Volume – At steady state the specific growth rate (μ) is equal to D – If μmax is < than D, culture will wash out • Turbidostat: – Cell density determines diluon rate – More stable at high‐diluon rates and low‐cell densies – μmax is more easily achieved Recombinaon Genec recombinaon is the process by which a strand of genec material (usually DNA; but can also be RNA) is broken and then joined to a different DNA molecule. • Prokaryoc recombinaon takes place aer horizontal gene transfer (as opposed to during meiosis in eukaryotes) • Three possible ways for the horizontal transfer of DNA: • Conjugaon • Transformaon • Transducon Transposion • Transposons are pieces of DNA that can “hop” in and out of target DNA sequences. • They code for a transposase which recognizes inverted repeats flanking the transposon (such a simple transposon is called inseron sequence, ISs containing other genes are called composite transposons) • Transposons play an important role in evoluon! Bacterial Plasmids • Plasmids are circular DNA molecules that can exists independently of host chromosomes and they: – Have their own replicaon sites (they are a replicon). – Contain a relavely small number of genes that are non‐ essenal to the host. – Can exists either as a single copy or mulple copies in a cell. – Episomes are plasmid that can integrate into the host genome. – Conjugave plasmids carry genes coding for pili allowing them to undergo horizontal gene transfer through conjugaon. • Types of Plasmids: – Ferlity Factors: allows for conjugaon; carries genes for sex pili formaon, DNA transfer, etc. Is an episome. – R Plasmids: resistance factors; carry genes capable of neutralizing anbiocs – Col Plasmids: code for bacteriocins, which are bacterial toxins – Virulence Plasmids: make their host more pathogenic – Metabolic Plasmids: as the name implies • Vectors are plasmids used in genec engineering. Conjugaon • Bacterial conjugaon is the transfer of genec material between bacteria through direct cell‐ to‐cell contact. • Lederberg and Tatum showed in 1946 that DNA could be transferred between two auxotrophic (triple auxotrophs) strains of bacteria • Bernard Davis then showed in 1950 that this DNA transfer requires direct physical contact. • F+ x F‐ conjugaon: transfers a f factor plasmid without transferring bacterial genes • Hfr conjugaon: transfer of an integrated f factor, causes transfer of chromosomal material, but as only part of the f factor is transferred recipient remains F‐ • F’ conjugaon: a Hfr host de‐integrates the f factor including part of the bacterial chromosome. The enre F’ plasmid is transferred. Transformaon • Transformaon is the uptake of naked DNA from the environment in an inheritable form. • The natural transformaon efficiency of competent cells is on the order of 10‐3 (1 in 1000 cells takes up DNA). • Laboratory generated competent cells have efficiencies on the order of 106 – 109 transformants per μg of DNA. • Reversal of auxotrophies or anbioc resistance is oen used to select for transformants in the lab. Transducon • Transducon is the process by which DNA is transferred from one bacterium to another by a virus. • Phage have two life cycles: – Lysogenic and lyc • Generalized transducon: consequence of the lyc cycle, bacterial DNA may be randomly packaged • Specialized transducon: if a prophage excises incorrectly and takes along a piece of chromosomal DNA Homework • Take a look at my favorite iGEM projects from 2008: – UC Berkeley: Clonebots hp://2008.igem.org/Team:UC_Berkeley – Imperial College: Biofabricator sublis hp://2008.igem.org/Team:Imperial_College – Caltech: mul‐funconal probioc bacteria hp://2008.igem.org/Team:Caltech – Harvard: Bactricity hp://2008.igem.org/Team:Harvard • Read up on some common/interesng bugs: – E.coli, S.cerevisiae, H.pylori, B.sublis, S.oneidensis, Magnetotacc bacteria Seminars • GHI Seminar every Thursday at 12:15 in AI 1153 • Friday, March 13th 2009 ‐ 15:30pm Locaon: AI 1 153 Life without a wall or division machine in Bacillus sublis .
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